1. A waiter recorded his tips from his 50 customers one day. He recorded them as grouped data as shown in the table at the right. Border values are included into the upper interval.

a) Calculate the mean, median and mode of his tips

b) Which measure best describes these data?

c) How do outliers affect the measures?

Tip range Frequency

0-2 4

2-4 5

4-6 20

6-8 4

8-10 0

10-12 8

12-14 2

14-16 5

16-18 0

18-20 2